CN1211826C - Electrode for high-pressure discharge lamp, high-pressure discharge lamp and making method thereof - Google Patents
Electrode for high-pressure discharge lamp, high-pressure discharge lamp and making method thereof Download PDFInfo
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- CN1211826C CN1211826C CNB011207671A CN01120767A CN1211826C CN 1211826 C CN1211826 C CN 1211826C CN B011207671 A CNB011207671 A CN B011207671A CN 01120767 A CN01120767 A CN 01120767A CN 1211826 C CN1211826 C CN 1211826C
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/073—Main electrodes for high-pressure discharge lamps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
- H01J61/822—High-pressure mercury lamps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/84—Lamps with discharge constricted by high pressure
- H01J61/86—Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection
Abstract
The present invention provides a high pressure discharge lamp which achieves a long life of at least 3000 hours and in which variations in lamp characteristics are suppressed is disclosed. In the high pressure discharge lamp of the present invention, during manufacturing of an electrode, a covering member 123 having a coil shape and being made of refractory metal is applied on a discharge side end of an electrode rod 122 made of refractory metal so as to cover a circumference of the electrode rod 122 in a vicinity of the discharge side end. The discharge side end 124 on which the covering member 123 is applied is fused into a semi-sphere by intermittently heat fusing the discharge side end according, for instance, to arc discharge or laser irradiation.
Description
The application is based on Japanese patent application No.2000-116699, No.2000-188785 and No.2001-94226, and proposes domestic priority with two applications in front, and its content herein as a reference and combined use.
Technical field
The present invention relates to the used electrode of a kind of high-pressure discharge lamp and a kind of high-pressure discharge lamp and manufacture method thereof.
Background technology
In recent years, the projection display device for example development of liquid crystal projection apparatus is comparatively active.In this projection section image display apparatus, must possess a high-intensity light source approaching with point-source of light.Usually utilize for example a kind of high-pressure mercury-vapor lamp of a kind of high-pressure discharge lamp or a kind of short arc formula metal halide lamp to be used as this light source.
One of major technique task of development short arc formula high-pressure discharge lamp is to prolong its useful life by the life characteristic that improves lamp.Promptly, generally, in short arc formula high-pressure discharge lamp, the tungsten filament that forms electrode melts and disperses, produce distortion and loss owing to the excessive temperature increase of electrode tip makes electrode end, and the tungsten of dispersing accumulates on the inner surface of luminous tube and make the luminous tube blackening.The blackening of the inner surface of luminous tube causes that luminous flux descends too early.In order to address this problem, design and the relevant multiple common technology of manufacture method thereof have been studied now with the used electrode of short arc formula high-pressure discharge lamp.
In the prior art relevant, developed a kind of electrode with structure as shown in Figure 1 with the design of above-mentioned electrode.Electrode 901 shown in Fig. 1 is to combine with a cylindrical electrode part 903 by the electrode stem 902 that is had than small axle diameter to form, and the internal diameter of described cylindrical electrode part 903 is greater than the diameter of axle of electrode stem 902.The operation characteristic of electrode is: (1) cylindrical electrode part 903 is passed to the temperature that electrode stem one side reduces electrode end 904 rapidly by the heat that will produce, and the fusing by electrode metal and disperse distortion and the loss that suppresses electrode end 904; (2) by having the work than the electrode stem 902 of small axle diameter, the integral body of electrode 901 is adiabatic, so just can impel the volatilization that is enclosed in the luminescent material in the luminous tube.
A kind of electrode as electrode 901 is undertaken by the block to high melting point metal materials such as tungsten normally that milled processed makes, and particularly be used as anode in short arc formula high-pressure discharge lamp such as extra-high-pressure mercury vapour lamp and DC (direct current) discharge type high pressure xenon lamp, above-mentioned these lamps all stand the rising of temperature.
Simultaneously, be used for metal halide lamp and short arc formula high-pressure mercury-vapor lamp at first with the electrode of the high-pressure discharge lamp same configuration that is used for the illumination of common long arc type, short arc formula high-pressure mercury-vapor lamp is used as the light source of projection display device in recent years.As shown in Figure 2, electrode 911 is to be formed by electrode stem of being made by common used tungsten 912 and the coil 913 that formed by the tungsten filament that has than small axle diameter.But, in the short arc formula high-pressure discharge lamp that uses as the electrode of electrode 911, can not avoid the distortion and the loss of the above-mentioned electrode end that fusing and dispersion owing to tungsten electrode material cause, so just be difficult to prolong the useful life of lamp.
Therefore, as a kind of method of the problem that solves the life-span that prolongs this lamp, restudied the electrode that is used for common short arc formula high-pressure discharge lamp and has the basic structure shown in Fig. 1 now.But,, now studied and had identical and electrode that can cheaply make with electrode 901 basic structures shown in Fig. 1 because it is higher to make the cost of electrode by the mode of grinding.For example, in the Japan Patent No.H10-92377 of Japan Patent No.2820864 and pending trial, disclosed the prior art relevant with kind electrode.
The example of electrode is shown in Fig. 3 A and 3B in the above-mentioned patent.Electrode 921 is made by two technical processs, compare with above-mentioned grinding technics process, these two technical processs are comparatively simple: (a) at first, tungsten filament coil 923 is wound on the discharge end of tungsten electrode bar 922 (referring to Fig. 3 A), (b) the discharge side of the discharge side of electrode stem 922 and coil 923 melts by so-called electric discharge and fuses together, and is the electrode end 924 of hemisphere (referring to Fig. 3 B) substantially thereby form one.
In electrode 921, has same effect by the electrode end 904 of terminal 924 parts that form of coil 923 and dome electrode and cylindrical part 903 shown in Fig. 1 and electrode 901.Therefore, the heat in the dome electrode end 924 just is sent to coil 923 rapidly and the temperature of reduction electrode end 924.In this mode, even electrode utilizes the manufacturing of lower-cost electric discharge, the fusing of electrode material and disperse and the distortion and the loss of electrode end also all can be suppressed, thus prolonged the life-span of lamp.
Please note: another piece prior art relevant with the life span that improves high-pressure discharge lamp is to utilize highly purified tungsten to be used as a kind of method of electrode material, disclosed this method in the Japan Patent No.H9-165641 of pending trial.Shown a result who utilizes high-purity tungsten herein, wherein, the total amount of element al, Ca, Cr, Cu, Fe, Mg, Mn, Ni, Si, Sn, Na, K, Mo, U and Th is controlled to the 10ppm of basis tungsten W in the attached constituent, and described tungsten is used as the life-span that electrode (being in particular anode) material can improve the lamp electrode effectively in the big discharge lamp of height output.
According to above-mentioned correlation technique, the inventor has developed a kind of short arc formula high-pressure mercury-vapor lamp that can be used as light source in projection display device.In development process, the inventor has set two targets relevant especially with the performance of the desired lamp in market.Described target is: (1) is provided with spacing distance between electrode, in other words, the distance that is arranged between the discharge end of two electrodes of the positioned opposite in the luminous tube is no more than 1.5mm, and this distance just can improve the utilance of light like this less than common interval in conjunction with a speculum time; (2) make the life span of lamp reach 3000 hours at least.The life span (will be described below) that please notes (2) lamp is to be determined by the ageing time of lamp, and ageing time is meant in luminescence process, and the mean flow rate conservation rate of 9 maintenances of the luminous flux conservation rate of the lamp unit of prediction from the phosphor screen dropped to for 50% required time.
When beginning to develop, the inventor has studied a kind of short arc formula high-pressure discharge lamp, compares with general lamp, and this lamp has short distance and utilized the electrode of making based on the electric discharge of the method in the above-mentioned patent (Fig. 3 A and 3B) between electrode.But when the inventor detected the overall characteristic parameter of the lamp that utilizes kind electrode and make, the inventor found at the characterisitic parameter of lamp such as voltage and has bigger variation between the life-span that this just means that this lamp lacks commercial survivability.
Secondly, when the above-mentioned variation that produces in the characterisitic parameter to lamp is studied, the inventor recognizes that the shape of the fusion of the electrode tip that utilizes traditional electric discharge production is not uniform hemisphere, but having produced different shape and size, these different shape and size are the reason of the characterisitic parameter variation of lamp.For example, when the shape of electrode end is not hemisphere, can produce such situation, wherein, electrical discharge arc departs from mutually with the axis between two electrodes.Therefore, the length of electrical discharge arc is just long than design load, and therefore, modulating voltage increases and the overrate scope.
Particularly, when within the target zone 1.5mm of distance between electrodes the inventor or less than this target, can know and recognize that modulating voltage can increase according to the fluctuation that this variation of discharge arc length produces.In addition, when the shape and size of the fusion of the electrode end between lamp changed, the temperature of electrode end just changed in discharge process, will cause the variation in the life-span of lamp like this.
Summary of the invention
The purpose of this invention is to provide a kind of high-pressure discharge lamp, a kind of high-pressure discharge lamp electrode and manufacture method thereof and wish to make the life-span of lamp to reach at least 3000 hours, and can suppress to utilize the variation of characterisitic parameter of the high-pressure discharge lamp of electrode, the discharge side of described electrode is fused.
By utilizing a kind of method that is used for producing high-pressure discharge lamp just can achieve the above object, this method comprises that a coating member applies step, just will be that the coating member of the material of main composition composition covers with tungsten with tungsten by this step be on the discharge side of the electrode stem made of the material of main composition composition, thereby around near the coated electrode bar discharge side, this method also comprises a fuse step, in this fuse step, the heat fused by interval property has applied the discharge side of coating member and the side that will discharge is integrated into hemisphere.
In this manufacture method, owing to being spaced apart property of the discharge side heating of electrode fuses, the temperature of control electrode end easily just in the electrode manufacture process like this.Just can suppress variation according to this method, more particularly, electrode end can be formed hemisphere and can not produce defective such as endoporus thereon as the shape of electrode end.The life-span of lamp can be prolonged like this and variation in the characterisitic parameter of lamp can be suppressed.
Please note: by heat fused at intervals, in the crystallization process of electrode end, the size of the average grain diameter in the crystal just can be increased.Like this, comprise the electrode made as the main composition material by tungsten and it is placed into the high-pressure discharge lamp of making in the luminous tube by a kind of, and make the hemispherical ends positioned opposite of electrode and the average grain diameter of the tungsten crystal of electrode tip is at least 100 μ m, so just can reach above-mentioned purpose.Owing to the average grain diameter of the crystal in the kind electrode has increased the thermal capacitance of electrode end greatly, thereby suppress the distortion of electrode, so just can prolong the life-span of high-pressure discharge lamp electrode.
Please note: as a kind of ad hoc approach of above-mentioned interval fusion hot in nature, the inventor finds as utilizes the method for electrical discharge arc fusion or utilizes the method for laser is desirable especially.
The present invention also proposes the used electrode of a kind of high-pressure discharge lamp, wherein, be that coating member that the material of main composition composition is made is applied to tungsten with tungsten be the discharge side of the electrode stem made of the material of main composition composition, thereby cover near the discharge side electrode stem around, the discharge side that is applied with coating member is integrated into hemisphere by the heating and fusing of interval property.
The present invention also proposes a kind of high-pressure discharge lamp, comprise two electrode of opposite, wherein, at least one of electrode of opposite comprises that one is the coating member that the material of main composition composition is made with tungsten, it is on the discharge side of the electrode stem made of the material of main composition composition that described coating member is applied to tungsten, thereby cover near the discharge side electrode stem around, the discharge side that is applied with coating member is integrated into a hemisphere by the heating and fusing of interval property.
By the description below in conjunction with accompanying drawing, these purposes of the present invention and other purposes, advantage and characteristics will be clearer and more definite, shown one particular embodiment of the present invention in the accompanying drawing.In the accompanying drawings:
Description of drawings
Fig. 1 has shown an example of the electrode that the high-pressure discharge lamp in the correlation technique is used;
Fig. 2 has shown an example of electrode used therein in the light source commonly used in the long arc type high-pressure discharge lamp;
Fig. 3 A and Fig. 3 B have shown by the discharge end that a coil is wrapped in electrode stem and with the current electrode of end fusion formation with dome electrode end;
Fig. 4 has shown the structure of the high-pressure mercury-vapor lamp of one embodiment of the present of invention;
Figure 5 shows that the partial sectional view of the structure of lamp unit 300;
Figure 6 shows that the figure of the manufacture process that is used for explaining electrode of the present invention;
Figure 7 shows that the figure that uses a model that is used for explaining the argon plasma welder 400 in first embodiment;
Figure 8 shows that an oscillogram, shown an example of the discharge cycles of the argon plasma welder in first embodiment among the figure;
Figure 9 shows that an oscillogram, shown another example of the discharge cycles of the argon plasma welder in first embodiment among the figure;
Figure 10 shows that an oscillogram, shown another example of the discharge cycles of the argon plasma welder in first embodiment among the figure;
Figure 11 has shown the variation that the luminous flux conservation rate produces with respect to ageing time in the high-pressure discharge lamp of first embodiment;
Figure 12 shows that as a comparative example, the variation that the luminous flux conservation rate produces with respect to ageing time in the general high-pressure discharge lamp;
Figure 13 A and Figure 13 B are the partial cross section diagrammatic sketch, have shown the defective in the electrode end in general high-pressure discharge lamp among the figure;
Figure 14 has shown the cutaway view of an example of the tungsten crystal on the end 124 of the electrode that high-pressure discharge lamp of the present invention is used;
Figure 15 has shown the variation that the luminous flux conservation rate produces with respect to ageing time in the high-pressure discharge lamp, all has different average grain diameters in the tungsten crystal of electrode end 124;
Figure 16 has shown the variation that the luminous flux conservation rate produces with respect to ageing time in the high-pressure discharge lamp, and the ratio of specific metal is also different in the ratio difference of the additional constituent of each of electrode material and the additional constituent;
Figure 17 has shown the schematic structure of Nd-YAG (neodymium-yttrium-aluminium-garnet) laser fusion device 500 used in the alloying process of the electrode end 124 in second embodiment;
Figure 18 shows that after the laser continuous radiation and the cutaway view of an example of the outward appearance of the peripheral region of the electrode end 124 of fusion;
Figure 19 has shown that the inventor comes an exemplary of setting laser radiation cycle according to the basic production condition of the electrode manufacturing method of second embodiment;
Figure 20 shows that the cutaway view that carries out the peripheral region of the electrode tip 124 that 5 laser emission fuses by the repetition rate of utilizing the 4Hz shown in Figure 19 at intervals.
Embodiment
With reference to the accompanying drawings, will be described the preferred embodiments of the present invention below.
First embodiment
Fig. 4 has shown the structure of the high-pressure mercury-vapor lamp in the embodiments of the invention.As shown in Figure 4, the high-pressure mercury-vapor lamp of this embodiment has a luminous tube 101, in described luminous tube 101, be furnished with a discharge space 111, and in described discharge space 111, be placed with two electrodes 102 and 103, described two electrode positioned opposite and have predetermined distance D e between them, each electrode are extended from the sealer 104 and 105 of each end of being arranged in discharge space 111 respectively.Described electrode 102 and 103 all has the structure identical with the electrode 921 shown in Fig. 3 B, and still, described electrode is made according to manufacture method provided by the invention, and this content will be described hereinafter.
The cladding of luminous tube 101 be form by quartz and substantially for spherical. Relative tungsten electrode 102 and 103 is by molybdenum sheet 106 and 107 and be sealed in respectively in sealer 104 and 105.Described molybdenum sheet 106 also links to each other with 109 with the molybdenum lead 108 of outside respectively with 107.According to the power output of lamp, the length that luminous tube 101 has for 30mm to 100mm, its largest outer diameter Do is 5mm to 20mm, and the maximum inner diameter Di of luminous tube 111 is 2mm to 14mm.
Herein, the distance D e between the tungsten electrode 102 and 103 is set in the scope of about 1.5mm to 2.5mm usually.But in high-pressure discharge lamp of the present invention, higher and improve brightness on the phosphor screen for the utilance that makes light, the value of described distance D e should be not more than 1.5mm, preferably is controlled in the scope of 0.5mm to 1.5mm.In fact, the manufacture method of electrode of the present invention is not limited in its spacing used in high-pressure discharge lamp from for 1.5mm or littler electrode, and electrode manufacturing method of the present invention also is applicable to the electrode of general high-pressure discharge lamp.
A kind of luminescent material mercury 110 and being used for carry out the rare gas of assistant starting such as argon, krypton, xenon with halogen such as iodine and bromine by globality be sealed in the emitting space 111.The amount of the mercury 110 of sealing preferably is controlled at the 150mg/cm at least of the volume of luminous tube 111
3Scope in (in the lamp lighting process, being about 150bar or higher mercury steam pressure).Sealing load that need to set rare gas is when cooling in the scope at 0.1bar to 10bar.
Please note: for example, when utilizing bromine, just need be set in 10 as halogen species
-9Mol/cm
3To 10
-5Mol/cm
3Scope in.Sealing so just can be by returning back to the blackening that described electrode suppresses luminous tube from the tungsten that electrode is dispersed on the inner surface that is deposited on luminous tube 101.Simultaneously, as shown in Figure 5, a complete lamp 200 of being constructed has a pedestal 120 that is installed in an end of luminous tube 101, and this complete lamp 200 also is equipped with a speculum 210, and above-mentioned these elements have constituted lamp unit 300 together.
In addition, shown in Fig. 6 A and 6B, electrode 102 (electrode 103 is as the same) is made by a kind of process for making, and wherein, (a) silk footpath is wrapped in (referring to Fig. 6 A) around the tungsten electrode bar 122 that the diameter of axle is 0.4mm for the double-deck tungsten filament coil 123 of 0.2mm; (b) with the end fusion of tungsten electrode bar 122 and double-deck tungsten coil 123 and form a hemisphere as an electrode end 124 (referring to Fig. 6 B).
At first, following content will be described the electrode manufacturing method of first embodiment of the present invention in detail.In this embodiment, argon plasma welder be used to carry out tungsten electrode bar 122 and double-deck tungsten coil 123 the end fusion process therefor and form a electrode with half-spherical tip 124.
To describe the fusion process therefor of carrying out by the argon plasma welder herein in detail.At this moment, as shown in Figure 7, the distance D p from the end of tungsten electrode 122 and double-layer coil 123 to the end of the electrode (negative pole) 401 of plasma welder 400 is set and remains 1.0mm, and carries out arc discharge.
This fusion process therefor be carry out by the arc discharge of a plurality of interval property and between arc discharge, should provide at least one cooling time.Fig. 8 has shown a particular case of this alloying process.In this example, alloying process P1 to P4 has carried out at intervals altogether 4 times and all had a cooling time between each fusion.
Fuse for the first time P1 and be the arc discharge that arc current by 26A carries out 50msec and carry out, and carried out continuously three times with 0.4 second interval.By this technical process, the end of the end of tungsten electrode 122 and double-deck tungsten coil 123 fuses together substantially, but does not form good sphere.
Next step is the cooling time in about 3 seconds, and the end of tungsten electrode bar 122 and double-layer coil 123 loses the red heat state that causes owing to arc discharge and returns back to the metallic luster state.Please note: the cooling among the present invention not only comprises the pressure cooling by certain mode, but also comprises and only make electrode carry out natural cooling.Be natural cooling the cooling time between each fusion shown in Fig. 8.
Carry out secondary fusion below.Fuse for the second time P2 and be the arc discharge that arc current by 26A carries out 50msec and carry out, and arc discharge carried out twice continuously with 0.4 second the time interval.According to this step, the end of tungsten electrode 122 and double-layer coil 123 just returns back to the red heat state and fuses, and near forming good hemisphere.
Then, after the cooling of carrying out for 3 seconds, utilize the arc current of 26A to carry out the arc discharge of 50msec and fuse P3 for the third time.After carrying out 1.5 seconds further cooling, utilize the arc current of 26A to carry out the arc discharge of 50msec and carry out fusion P4 the 4th time.By above-mentioned fusion P1 to P4, the end of tungsten electrode bar 122 and double-deck tungsten coil 123 just forms the hemisphere of a basic perfect.
In this mode, by reserving cooling time simultaneously fusing between one and a plurality of arc discharge, it is average on the whole that the temperature of the end of tungsten electrode 122 and double-deck tungsten coil 123 raises, and so just can more easily control fusion temperature.Based on this point, just can obtain a part that has the hemisphere ideal electrode terminal 124 of durability and do not have defective such as hole or incomplete fusion on it.
Please note: in whole alloying process, need total cooling time of setting longer than total arc discharge time.For example, in example shown in Figure 8, carried out 7 times 50msec arc discharge, then the total time of arc discharge is 350msec, and be 7.5 seconds total cooling time, thereby longer than the arc discharge time.
Please note: the example of desirable alloying process is not limited in example shown in Figure 8.Can set the amount of some conditions, thereby reach purpose of the present invention as the length of the quantity of the arc discharge in each fusion and the time interval between the arc discharge, cooling time and the arc current that in scope, changes.
For example, as shown in Figure 9, carry out fusing the first time P1 by carrying out 4 arc discharges with 0.6 second the time interval, reserve 2 seconds cooling time, carry out 2 arc discharges and carry out fusing the second time P2 with 0.4 second the time interval then, reserve 3 seconds cooling time, carry out 1 arc discharge then and fuse P3 for the third time, reserve 1.5 seconds cooling time, carry out 1 arc discharge at last and carry out the 4th fusion P4, just can form an ideal hemispherical of the part that does not remain defective such as hole or incomplete fusion by above-mentioned steps.
Another kind of alternative mode is, when the possibility that forms a good hemisphere descends a little, just can obtain electrode end 124 in allowed band by technical process shown in Figure 10, in Figure 10, carry out 2 arc discharges and carry out fusing the first time P1 with 0.2 second the time interval (arc current 23A), after carrying out 4 seconds cooling, carry out 1 arc discharge and carry out fusion P2 the 2nd time, after carrying out 1.5 seconds further cooling, carry out 1 arc discharge and carry out fusion P3 the 3rd time.
Please note: wish in the production to utilize so-called pure pure tungsten, attached constituent wherein such as the total amount of Al, Ca, Cr, Cu, Fe, Mg, Mn, Ni, Si, Sn, Na, K, Mo, U and Th to be restricted to 5ppm or still less to be used as tungsten electrode 122 and the material of double-layer coil 123.In addition, in above-mentioned attached constituent, the total amount of alkalinous metal Na, K, Fe, Ni, Cr and Al need be limited in 3ppm or still less.
Below content will be illustrated as the luminous flux conservation rate in the working life process of research life characteristics of lamp such as lamp and the result that the high-pressure mercury-vapor lamp of present embodiment detected and detects by the inventor.
At first, carried out for the first time detecting, the inventor has studied the variation in the life characteristics of high-pressure mercury-vapor lamp of this embodiment., utilize electrode 102 (with 103) structure as the used detection lamp of present embodiment mesohigh mercury vapor lamp herein, the end 124 of described electrode 102 (with 103) is to form according to the discharge cycles among Fig. 8.In addition, be the purpose that compares, prepare and detected general high-pressure mercury-vapor lamp according to same mode.Please note: examined general high-pressure mercury-vapor lamp is to construct with the electrode 102 (with 103) in the high-pressure mercury-vapor lamp in the 921 replacement present embodiments of the electrode shown in Fig. 3 B.
Please note: the electrode 921 of general detection lamp is made by manufacture process as shown in Figure 3A, wherein, it is on 0.4 the tungsten electrode bar 922 that the double-deck tungsten coil 923 (8 circle) that utilizes the silk footpath to form for the tungsten filament of 0.2mm is installed in the diameter of axle, then, the end of tungsten electrode bar 922 and tungsten coil 923 fuses by the plasma welder, and electrode end 924 just forms the hemisphere shown in Fig. 3 B like this.
Please note: the alloying process of electrode end 924 is to be undertaken by the general arc type technology of once discharging, wherein, set the terminal of tungsten electrode bar 922 and tungsten coil 923 and the distance between the end of the electrode (positive pole) 401 of the plasma welder shown in described end and Fig. 7 is remained the distance D p of 1.0mm, utilize the arc current of 20A only to carry out arc discharge 1 time.
In addition, a kind of so-called free from admixture high-purity tungsten is used as the constituent material of tungsten electrode bar 922 and tungsten coil 923, and wherein, the total amount of above-mentioned attached constituent is limited in 10ppm.In addition, the electrode 102 of the detection lamp in the present embodiment and 103 material are the higher tungsten of a kind of purity, wherein, the total amount of above-mentioned attached constituent is 5ppm, and the total amount of contained alkalinous metal Na, K, Fe, Ni, Cr and Al is 3ppm in these attached constituents.
Please note: in testing process, all power outputs that detect lamp all are set at 150W, and luminous tube is of a size of: the largest outer diameter Do of the mid portion of pipe (referring to Fig. 4) is 9.4mm, and the maximum inner diameter Di of pipe (referring to Fig. 4) is 4.4mm.In addition, the distance D e between two electrode ends is 1.1mm, and the internal capacity of pipe is 0.06cm
3And the length L o of pipe (referring to Fig. 4) is 57mm.In addition, (the quality volumetric ratio of pipe is 190mg/cm to be sealed with the mercury of 11.4mg in pipe
3, equal the mercury steam pressure 190bar in lighting process) and the argon of 200mbar.
In detection, prepared the high-pressure mercury-vapor lamp of several present embodiments and according to the general mercury vapor lamp of above-mentioned standard, each lamp is all assembled and form the lamp unit 300 shown in Fig. 5, and the burn-in test that carries out according to the ratio of closing the lamp time of 3.5 hours illuminations and 0.5 hour is finished life tests.In addition, just can obtain the mean value of brightness at 9 from the fluoroscopic center of lamp unit 300, according to this result, but according to the ansi standard IT7.215-1992 mean value (ratio of mean flow rate and 3 hours ageing times) of sensed luminance conservation rate just, and with this as the luminous flux conservation rate of lamp in the life-span.
The result who detects according to above-mentioned condition and to the life-span of lamp is shown in Figure 11 and 12.The life characteristics of the detection lamp (hereinafter referred to as " present embodiment detection lamp ") for preparing as present embodiment as shown in figure 11, the life characteristics of the detection lamp (hereinafter referred to as " general detection lamp ") for preparing as utility lamp is as shown in figure 12.
Can see that from Figure 11 in 500 hours ageing time, the luminous flux conservation rate that the neither one present embodiment detects lamp is lower than 50%.Particularly, even after at least 3000 hours ageing time, still have 50% or higher luminous flux conservation rate with g3, g4 and the represented lamp of g5.In other words, these light fixtures have at least 3000 hours life-span.
In addition, as shown in figure 12, the life characteristics of general detection lamp has bigger variation between each lamp.From lamp (g11 shown in Figure 12 and g12) to lamp (g16 the figure), their life characteristics all changes, wherein, lamp g11 and g12 luminous flux conservation rate are dropped rapidly in 500 hours ageing time and are lower than 50% level, and lamp g16 remains on the luminous flux conservation rate in 3000 hours ageing time and is higher than on 50% the higher level.
In this case, in the lamp that the luminous flux conservation rate descends, can be observed the even blackening of luminous tube and along with ageing time surpassed 1000 hours and the decline (because phenomenon that bleaches that the crystallization again of quartz causes) of the light transmittance of the quartz of the luminous tube that produces.When lamp blackening or light transmittance descend when excessive, the luminous flux conservation rate descends and is lower than 50% lamp and will stands the expansion of the increase of temperature and luminous tube, particularly top part and damage.Please note: the difference in Figure 11 and Figure 12 number (*) is each and detects the point that lamp damages.
In addition, when the electrode that detects lamp disconnects and when studying, can find particularly luminous flux conservation rate decline in 500 hours or shorter ageing time and the fusion state that is lower than the electrode tip of 50% detection lamp (utility lamp) is uneven life tests after.That is to say, cause defective by fusion process therefor, the part of the hole in the half-spherical tip 924 of the fusion as shown in Figure 13 A and the tungsten coil 923 of the part that should be hemisphere 924 as shown in Figure 13 B is not fused yet.
The reason that these defectives produce is as follows.Be: the optimum fusion temperature during the general arc type that once discharges fuses when being difficult to be controlled at the consumable electrode end.Particularly, because the part that the local rising suddenly of the temperature of electrode tip and excessive rising promptly can exist hole and incomplete fusion.
On the contrary, the fusion process therefor of the hemisphere of the electrode end 124 of formation lamp is not a described general arc discharge method in the present embodiment, but between one and a plurality of arc discharge, fuse at intervals, between each fusion, providing one period cooling time simultaneously.Therefore, the rising of the temperature of electrode tip is to control uniformly and easily generally.According to this method, in electrode 102 end 124 of (with 103), just there are not described defective such as hole and incomplete fusion part, this lamp has shown life characteristic preferably.
In addition, in above-mentioned detection, in ageing time is 1000 hours to 3000 hours process, descend and be lower than 50% detection lamp (g13 to g15 among Figure 12) for the luminous flux conservation rate, the fusion state of the end 924 of electrode 921 looks even, but when scrutinizing the state of tungsten crystal, the size that can find the crystal grain in the tungsten crystal is less than the size of the crystal grain that the luminous flux conservation rate is kept being at least 50% detection lamp in 3000 hours ageing time.
As shown in figure 14, in fusion process, the crystal in the electrode end is radial growth normally, and in the crystal structure process, the size of crystal grain is based on the condition of melting process.Please note: the average crystal grain diameter in the tungsten crystal is by the extreme length size d1 that makes progress of footpath with in the midpoint of d1 and determined with the perpendicular size d2 of the line of d1.In fusion process, be difficult to obtain the independent correlation (as the intensity of arc current, the length of discharge time, the number and the length of the time interval therebetween and cooling time of arc discharge in each fusion) between each condition.But the basic condition that the inventor finds is: the temperature in alloying process is high more, and the time of fusion is long more and particle diameter in the crystal is just big more.
Therefore, the inventor has carried out detecting for the second time average grain diameter size (mean values of a plurality of representational crystal grain) in the tungsten crystal of studying electrode end and correlation between life characteristic parameter such as the luminous flux conservation rate.Within the specific limits by changing the electrode sample that different condition manufacturings has different fusion states and tungsten crystal state (particle diameter), described scope can satisfy two conditions of alloying process of the electrode tip of lamp, (i) carrying out repeatedly fusion by at least arc discharge at intervals once and between the multiple discharge, (ii) between fusion, provide one period cooling time.In detecting for the second time, just use these electrodes.
Please note: in detecting for the second time, the total amount of above-mentioned attached constituent is 5ppm, and the total amount of contained alkalinous metal Na, K, Fe, Ni, Cr and Al is 3ppm in these attached constituents.
For the second time the result who detects as shown in figure 15, this result has proved that the average grain diameter da of tungsten crystal of electrode end is big more, resulting life characteristic parameter is good more.Particularly, this result has proved: when the average crystal grain diameter that detects lamp is 100 μ m or bigger (g24 to g26 shown in Figure 15), the raising effect of the life characteristic of lamp sharply increases, and the luminous flux conservation rate in the time of can obtaining surpassing 3000 hours ageing time is at least 50%, and this makes us rejoicing in.In other words, if average grain diameter is 100 μ m or bigger, just can obtain the high-pressure mercury-vapor lamp that a kind of life-span is at least 3000 hours.
In addition, this result also proves: when average grain diameter is 200 μ m or bigger (g26 among Figure 15), can obtain higher luminous flux conservation rate, the luminous flux conservation rate when ageing time is 6000 hours is at least 50% (in other words, the life-span of lamp was at least 6000 hours).
For example, though in Figure 15, do not show, when being 200 μ m, after 6000 hours ageing time, can obtain 51% light flux conservation rate according to discharge cycles shown in Figure 8 average grain diameter da in the tungsten crystal of the electrode end of fusion.In addition, according to same mode, when utilizing the discharge cycle shown in Fig. 9 to fuse, when the average grain diameter da of the tungsten crystal of electrode end is 200 μ m, can obtain the satisfactory lifetime characteristics parameter.
In addition, provable; When the average grain diameter in the tungsten crystal is big, can suppress the blackening of luminous tube 101.Therefore, the reason that improves the luminous flux conservation rate is and suppresses tungsten and disperse from electrode end and make the luminous tube blackening.In addition, the Another reason that improves the luminous flux conservation rate is: the diameter of the crystal grain of electrode tip is big more, and its heat conductivity is good more, but like this with regard to the conduction of accelerated heat to the electrode rear portion, thereby the heat of minimizing electrode tip.
In addition, the inventor utilizes the high-pressure discharge lamp of this embodiment to carry out detecting for the third time, in order to study the relation between a plurality of tungsten material electrodes and the light flux conservation rate, the fusion of the electrode of Jian Ceing for the third time is to carry out according to the discharge cycles shown in Fig. 8.Testing result as shown in figure 16.
In Figure 16, T is the total amount (unit: ppm) of the attached constituent in the electrode material of each detection lamp.What A indicated is the total amount (unit: ppm) of alkalinous metal Na, K, Fe, Ni, Cr and Al in the attached constituent.For example, life characteristic by the detection lamp shown in the g31 in, the total amount of the attached constituent of electrode material is 10ppm, wherein the total amount of alkalinous metal Na, K, Fe, Ni, Cr and Al is 5ppm.
From Figure 16, can see, when the total amount of attached constituent is reduced to less than 10ppm, light flux conservation rate is improved, and particularly, the minimizing of alkalinous metal Na, K, Fe, Ni, Cr and Al in the attached constituent has bigger influence to the raising of luminous flux conservation rate.Particularly, provable: as, just the amount of alkalinous metal Na, K, Fe, Ni, Cr and Al in the attached constituent need to be reduced to 3ppm or still less for the life-span (ageing time of lamp drops to until the luminous flux conservation rate and is lower than 50%) that makes lamp reaches 3000 hours or more.
Attached constituent in the tungsten electrode has two kinds of influences to the life characteristic of lamp: (i) since described attached constitute react with airtight halogen in ageing process as the alkalinous metal from the tungsten material, dispersed, and make the quantity not sufficient of the required halogen of the halogen cycle that is used for suppressing the luminous tube blackening and carries out, (ii) the quartz of attached constituent of the part of vaporize and luminous tube reacts and has formed the nucleus that carries out crystallization again, thereby has quickened the loss of quartzy light transmittance.
Such as above-mentioned detect for the third time proof, in the high-pressure mercury-vapor lamp of present embodiment, by in electrode material, utilizing highly purified tungsten electrode, both can suppress blackening owing to the aging luminous tube that causes, can suppress the loss of the light transmittance of luminous tube quartz again, the total amount of the attached constituent except tungsten in the high-purity tungsten electrode has reduced, and the total amount of special metal in the attached constituent such as alkalinous metal has reduced.
Second embodiment
To explain the second embodiment of the present invention below.
As described in first embodiment, by heating and fusing at intervals even just can suppress variation in the shape of electrode end by the arc discharge fusion, but the inventor estimates and utilizes the method for laser processing more to have superiority on principle after further the method for analysis and utilization laser manufacturing electrode has higher accuracy than the method among first embodiment.That is to say, can estimate; Because used laser post is radiated position and the power that can control radiation on the electrode end 124 more accurately in the laser processing, so just can reduce the variation in the shape and size of fusion.
Therefore, the inventor studies the electrode manufacturing method of foundation laser processing.Generating laser such as CO
2Generating laser and laser diode (LD, semiconductor laser transmitter) reflector is relatively to be suitable in metal processing, but the inventor has selected a kind of Nd-YAG pulse laser reflector for use, and the wavelength that this reflector sends is the laser of 1064nm.Particularly, when fusing and processing electrode end 124, the above-mentioned working condition that can further improve the laser fusion method of accuracy is studied.Next step, the inventor has prepared to utilize the detection lamp of the electrode of making according to laser processing method under this working condition, and has detected the characterisitic parameter of lamp such as the voltage and the luminous flux conservation rate of lamp.In addition, the inventor has observed the fusion shape and size of fusion electrode end 124 simultaneously, and has studied the correlation between the characterisitic parameter of the lamp that detects.
Figure 17 has shown and has been used to fuse a kind of schematic configuration that electrode is not held 124 Nd-YAG laser fusion device 500 in the present embodiment.Please note: 501 among Figure 17 is cavitys, is provided with an electrode therein, and parts 502 are that wavelength is a vibrator of the Nd-YAG pulse laser of 1064nm, and parts 503 are an optical fiber, and parts 504 are optical systems.
Herein, the fusion of electrode end 124 is carried out by two production processes: the tungsten electrode bar 122 that (1) will be wound with double-deck tungsten coil 123 is arranged in the described cavity 501, be filled with argon gas in the described cavity 501, (2) with laser emission to the end of tungsten electrode bar 122 and double-deck tungsten coil 122 and carry out fuse process.
Please note: except the fusion method of electrode, be identical among the design of used detection lamp and first embodiment in the research.That is, the input power of lamp is set at 150W, and luminous tube is of a size of: the largest outer diameter Do of the mid portion of pipe (referring to Fig. 4) is 4.4mm for the maximum inner diameter Di (referring to Fig. 4) of 9.4mm pipe.In addition, the distance D e between two electrode ends is 1.1mm, and the internal capacity of pipe is 0.06cm
3And the length L o of pipe (referring to Fig. 4) is 57mm.In addition, (the quality volumetric ratio of pipe is 190mg/cm to be sealed with the mercury of 11.4mg in pipe
3, equal the mercury steam pressure of 190bar in lighting process) and the argon of 200mbar.Please note: tungsten electrode bar 122 and tungsten coil 123 used materials are so-called pure high-purity tungsten in the present embodiment, and wherein, the maximum of the total amount of the above-mentioned attached constituent in the tungsten is restricted to 10ppm.But, wish to use purer tungsten naturally, wherein the total amount of attached constituent is 5ppm and the total amount of wherein alkalinous metal Na, K, Fe, Ni, Cr and Al is 3ppm, this with first embodiment in be identical.
In addition, be identical to the detection of characterisitic parameter such as life tests and the detection that detects the luminous flux conservation rate of lamp with mode among first embodiment.That is to say that the life tests that detects lamp is by being assembled into the lamp unit 300 shown in Fig. 5 and carrying out through over-illumination 3.5 hours and 0.5 hour cycle of disconnection.In addition, just can obtain the mean value of brightness at 9 from the fluoroscopic center of lamp unit 300, according to this result, just can detect mean flow rate conservation rate (ratio of mean flow rate and 3 hours ageing times) according to ansi standard IT7.215-1992, and with this as the luminous flux conservation rate of lamp in the life-span.
At first, Figure 18 has shown according to the working condition of laser processing method the result when carrying out laser emission continuously.As shown in figure 18, the fusion shape of electrode end 124 is compared with hemisphere and is more resembled a spheroid, and therefore, this processing procedure is inappropriate as the fusion method of electrode end 124.This is because when carrying out laser emission continuously, the rising that the treatment temperature of electrode tip is rapid and excessive and make the too many of electrode end 124 fusings.
Based on above discovery, the inventor finds with preset time at interval and repeat laser emission with predetermined times to be used as working condition more suitable.This is basic process for making in the laser fusion method of present embodiment.According to this technical process, when electrode end 124 is fused, treatment temperature can be controlled within the suitable scope, so just can adjust and make its shape electrode end 124 more near hemisphere.
Please note; In this case, found that the frequency range of 1Hz to 20Hz is suitable for repeating to handle the time interval of laser emission.In laser oscillator 502, utilize known method with regard to this repetition rate of may command.Figure 19 has shown exemplary in the laser emission cycle that the inventor sets according to the basic production condition of the electrode manufacturing method of this embodiment.The example that shows among Figure 19 carries out the example that 5 radiation fuse at intervals altogether for the repetition rate of utilizing 4Hz.Please note: the fusion temperature in first embodiment is to be controlled by the number of times of arc discharge, but also can reach same effect by the output of regulating laser in this embodiment.In other words, in example shown in Figure 19, the output of laser in (the 5th) laser emission is slightly less than the laser output of front the last time, but, this is that this is identical with controlling the effect that reaches by the number of arc discharge because along with the carrying out of annealing crystallization has again taken place.In fact, can be set the time interval of controlling according to the mode identical with first embodiment between the laser emission of interval property.
In addition, utilize method that annealing carries out crystallization again except reduce with last radiation that other radiation are compared in laser output, also can reduce the laser of a plurality of last laser emissions one by one and export.
Figure 20 has shown an example of the fusion shape of electrode end 124 in this case.As shown in Figure 20, as the result who carries out the laser treatment of laser emission at intervals, the shape after the processing of provable electrode end 124 is hemisphere substantially, and the variation in the size of fusion is suppressed and is improved.Please note: this result proves that also the average grain diameter that has realized in the crystallization again is at least 200 μ m.
The result of the detection that will be described as detecting the main purpose of the variation in the characterisitic parameter of the lamp between a plurality of lamps below and carry out, the electrode end 124 that is used to make the electrode that detects lamp utilizes above-mentioned laser processing method fusion and handles.
In this research, after 1 hour ageing time, at first measured the voltage V1a of lamp.The result who finds is decreased to V1a=61+5V for the variation of the voltage between a plurality of lamps.The inhibition that this variation is carried out is considered to the result that the precision of the fusion of electrode 124 improves, and makes the shape and size of electrode become more even like this.If used kind electrode, just can reduce the variation among the distance between electrodes De substantially.That is to say, when the shape of electrode end 124 changes, electrical discharge arc is just removed from the axis between two electrodes in the lighting process, just means that also distance between electrodes De is longer than the value of design, and the voltage of lamp may increase and above the scope of initial rated value.But the method that has demonstrated by utilizing present embodiment just can reduce this variation.
Simultaneously, during measuring light flux conservation rate φ 1a, the result of measurement is φ 1a=78+8% after 3000 hours the lamp ageing times, and the variation that this result demonstrates between the lamp has reduced.Therefore, this just proves the inventor and has realized more definitely that the life-span of lamp reaches 3000 hours or multiple target more.
Please note: the improvement of the variation in the luminous flux conservation rate is also considered because the fusion shape and size of electrode end 124 become more evenly, the vaporized state of the tungsten of fewer fluctuation between the variations in temperature in the lighting process between a plurality of lamps and the lamp.
As mentioned above, produce electrode by the laser fusion method of utilizing working condition, wherein, the fusion of electrode end 124 is to be undertaken by the laser emission of carrying out predetermined number at intervals, electrode end more certainty fuses into a hemisphere, and the variation of the shape and size between the lamp is suppressed.Therefore, prove:, also improve to confirmability the life-span of high-pressure discharge lamp even the arc length that high-pressure discharge lamp has is shorter than utility lamp.
Change
According to different embodiment the present invention is explained, but content of the present invention is not limited in the specific examples in the foregoing description; For example, can carry out following change.
(1) be: the power output of the lamp in two above-mentioned embodiment all is made as 150W, but also manufacture method of the present invention can be used in other the lamp input product.May there be such situation, promptly must change the silk footpath of the diameter of axle or the coil 123 of some characterisitic parameters such as electrode stem 122, in these cases as the intensity (under the situation of arc discharge processing) of the quantity at the interval between the arc discharge, the length of cooling time, arc current and should make corresponding changes as the power output and the repetition rate (under the situation in laser emission) of laser emission.Principle based on the electrical discharge arc and the laser fusion of interval property, variation in the shape and size that just can suppress to fuse according to above-mentioned method, can illustrate that the optimization of promptly within the scope of the present invention each condition being carried out by the treatment conditions of inventor's discovery can easier be carried out usually, carry out the heating and fusing of property at interval in the present invention.
(2) in addition, in second above-mentioned embodiment, shown the example that the electric current with 4Hz repeats, that is to say that the time interval between the laser emission in this example is the length (referring to Figure 19) of a setting.This is that the present invention is desirable, because can more easily construct the control circuit in the laser oscillator 502 like this, but the time interval between the laser emission needn't be the length of a setting, it can change, as described above, for laser emission begin several times time interval can be different several times with subsequently.
(3) in addition, in the embodiment described above, double-layer coil 123 is wrapped on the electrode stem 122, but is not limited in coil at the parts of discharge end place coated electrode bar 122, for example, can utilize as tubular parts.In addition, what coil also needn't be for bilayer, also needn't have 8 circles.
(4) in addition, utilize the main composition composition of tungsten in the above-described embodiments, but electrode can utilize also other heating resisting metals as the main composition composition as the material of electrode stem 122 and coil 123.
Though in conjunction with the accompanying drawings and by example the present invention has been carried out comprehensive description, it should be noted that to different changes of the present invention and change should be clear and definite to one skilled in the art.Therefore, the change of being made and the change without departing from the scope of the invention, they all are included within the scope of the present invention.
Claims (15)
1. method that is used for making high-pressure discharge lamp, this method comprises:
A coating member apply step, it is the discharge side of the electrode stem made of the material of main composition composition that a coating member that with tungsten is the material of main composition composition is made is applied to tungsten, thus coating member cover described discharge side described electrode stem around;
A fuse step, by the discharge side of the described electrode stem that is applied with coating member of heating and fusing at intervals described discharge side being integrated becomes a hemisphere.
2. method according to claim 1 wherein, in fuse step, is carried out repeatedly the fusion of the discharge side of the electrode stem that is undertaken by at least arc discharge at intervals.
3. method according to claim 2 wherein, in fuse step, repeatedly provides one period cooling time between the fusion each described.
4. method according to claim 3, wherein, described cooling time total time longer than the total time of described at least arc discharge.
5. method according to claim 2, wherein, this method will be utilized fusion repeatedly, the number of the arc discharge that carries out in fusion for the first time is maximum, and the number of the arc discharge in each fusion of carrying out in the back is no more than the number of the arc discharge in the last fusion in its front.
6. method according to claim 1, wherein, in fuse step, the discharge side of electrode stem is to fuse by the interval property laser emission with predetermined number.
7. method according to claim 6 wherein, all has the consistent time interval between the laser emission of each predetermined number of carrying out.
8. method according to claim 7 wherein, is used for control time repetition rate at interval in the scope of 1Hz to 20Hz.
9. method according to claim 7, wherein, the power output of the laser emission of last predetermined number is lower than the power output of the laser emission of carrying out previously.
10. method according to claim 7, wherein, in the laser emission of the repeatedly predetermined number that in the end carries out, output power of laser reduces gradually.
11. method according to claim 6, wherein, what use in the laser emission is a kind of neodymium-yag laser.
12. method according to claim 1, wherein, described coating member is that the coil that is wrapped in electrode stem constitutes.
13. electrode that high-pressure discharge lamp is used, wherein, be that coating member that the material of main composition composition is made is applied to tungsten with tungsten be the discharge side of the electrode stem made of the material of main composition composition, thereby coating member cover the discharge side described electrode stem around, the discharge side that is applied with coating member is integrated into hemisphere by the heating and fusing of interval property.
14. high-pressure discharge lamp, comprise two electrode of opposite, wherein, at least one of electrode of opposite comprises that one is the coating member that the material of main composition composition is made with tungsten, it is on the discharge side of the electrode stem made of the material of main composition composition that described coating member is applied to tungsten, thereby coating member cover the discharge side described electrode stem around, the discharge side that is applied with coating member is integrated into a hemisphere by the heating and fusing of interval property.
15. high-pressure discharge lamp according to claim 14, wherein, the distance between the electrode of opposite is no more than 1.5mm.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
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| JP2000116699 | 2000-04-18 | ||
| JP116699/2000 | 2000-04-18 | ||
| JP188785/2000 | 2000-06-23 | ||
| JP2000188785 | 2000-06-23 |
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| CNB2004100474269A Division CN100370577C (en) | 2000-04-18 | 2001-04-18 | Electrode for a high pressure discharge lamp and high pressure discharge lamp |
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| CN1321998A CN1321998A (en) | 2001-11-14 |
| CN1211826C true CN1211826C (en) | 2005-07-20 |
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| CNB2004100474269A Expired - Lifetime CN100370577C (en) | 2000-04-18 | 2001-04-18 | Electrode for a high pressure discharge lamp and high pressure discharge lamp |
| CNB011207671A Expired - Lifetime CN1211826C (en) | 2000-04-18 | 2001-04-18 | Electrode for high-pressure discharge lamp, high-pressure discharge lamp and making method thereof |
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| US (1) | US6705914B2 (en) |
| EP (1) | EP1148534B1 (en) |
| CN (2) | CN100370577C (en) |
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| JP2003051282A (en) * | 2001-08-06 | 2003-02-21 | Nec Lighting Ltd | High-pressure electric discharge lamp and manufacturing method therefor |
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| JP4400106B2 (en) * | 2003-06-18 | 2010-01-20 | ウシオ電機株式会社 | Ultra high pressure discharge lamp lighting device |
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| WO2009133773A1 (en) * | 2008-04-30 | 2009-11-05 | 岩崎電気株式会社 | Electrode for ultra-high pressure mercury lamp and ultra-high pressure mercury lamp |
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- 2001-04-17 US US09/836,726 patent/US6705914B2/en not_active Expired - Lifetime
- 2001-04-18 CN CNB2004100474269A patent/CN100370577C/en not_active Expired - Lifetime
- 2001-04-18 CN CNB011207671A patent/CN1211826C/en not_active Expired - Lifetime
- 2001-04-18 EP EP01303518.3A patent/EP1148534B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN100370577C (en) | 2008-02-20 |
| CN1547237A (en) | 2004-11-17 |
| EP1148534B1 (en) | 2014-05-14 |
| US6705914B2 (en) | 2004-03-16 |
| US20010030498A1 (en) | 2001-10-18 |
| CN1321998A (en) | 2001-11-14 |
| EP1148534A1 (en) | 2001-10-24 |
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